Weight loss: A burden shared

SHEDDING kilos is harder than putting them on, which is why the weight-loss industry is so big. Its latest manifestation is online weight-management sites: social networks for the plump in which participants can set a target weight and monitor their progress towards it.As with other social networks, they can also get help from friends--either real-life ones who sign up to the same site, or else digital ones whom they have befriended on the internet. Those friendships are likely to be important. ...